This is a duplicate question from Server Fault: Answer Here
Java Web Start utilizes TCP so it has to be enabled and configured in Jenkins...
- Login to Jenkins as admin
- Manage Jenkins > Configure Global Security > TCP port for JNLP agents
Do yourself a favor and pick a static port assignment...
与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…